Ballast Capacitors


Ballast Capacitors

These capacitors are used in light fittings like Sodium-Vapor Lamps, Mercury-Vapour Lamps, Fluorescent Lamps, Discharge Lamps etc.

DIMENSIONS:

MFD Value

Voltage

Container
Size in mm

Plastic
aluminum
Dia
Height
Dia
Height

3.15

440

28/30
x
55
28
x
55
30
x
55
30
x
55
35/38
x
73
38
x
73
45
x
73
45
x
95
28
x
52
28
x
52
30
x
52
30
x
52
35
x
68
38
x
68
45
x
67
45
x
97

4

250

8

250

10

250

15

250

20

250

33

250

42

250

Light is a form of electromagnetic radiation. Lamps can be broadly classified as follows:

  • INCANDESCENT LAMPS
  • ELECTRIC ARC LAMPS
  • GAS DISCHARGE LAMPS

An important characteristic of any discharge is that, once started, the current tends to increase instantaneously to a destructive value. A choke (referred to as ballast) is incorporated in the AC circuit to limit the current to a safe value.

Fluorescent and Discharge Lamps have a inherent low power factor of the order of 0.4 lag to 0.5 lag. Power factor is improved by the use of capacitor having capacitance value ranging from 3 MFD to 45 MFD and power factor is corrected to 0.85 lag to 0.90 lag which is acceptable for proper utilization of power. The capacitor provides a low impedance path to interference currents & helps to by pass any third harmonic currents.